Utilities Center

JSON Formatter & Validator

Indent, format, and check raw JSON

Paste a raw JSON string to instantly beautify or minify it and catch syntax errors, with your choice of indent size — all in your browser.

Indent
Formatted output
Formatted JSON will appear here.

About the json formatter & validator

The JSON formatter & validator takes any raw JSON string — whether it is minified onto one line, messy, or hand-typed — and parses it into a clean, indented structure you can actually read. It also validates the syntax, so a missing comma, trailing comma, or unquoted key is flagged with a precise error message before the JSON breaks your code.

JSON (JavaScript Object Notation) is the standard format for exchanging data between servers and web apps. Formatting it with consistent indentation makes nested objects and arrays far easier to inspect when debugging an API response or a config file.

Options

  • Indent size — 2 spaces, 4 spaces, or a tab character.
  • Minify — collapse the JSON onto a single line with no extra whitespace, ideal for production payloads.
  • Validation — invalid JSON shows the exact parser error so you can fix it fast.

How to use the json formatter & validator

  1. Paste your JSON

    Drop a raw JSON string into the input box — minified or messy is fine.

  2. Choose indent or minify

    Pick an indent size, or toggle Minify to compress the output onto one line.

  3. Read or copy the result

    Valid JSON is reformatted instantly; invalid JSON shows a clear error. Click Copy to use it.

Frequently asked questions

What does a JSON formatter do?
It parses your raw JSON and re-serializes it with consistent indentation and line breaks, turning a dense single-line string into a readable, nested structure.
How does JSON validation work?
The tool runs your input through a strict JSON parser. If the syntax is invalid — a missing comma, an unquoted key, or a trailing comma — it reports the exact error and position.
Can I minify JSON with this tool?
Yes. Toggle the Minify option to strip all optional whitespace and produce the smallest valid single-line JSON string, perfect for production payloads.
Is my JSON sent to a server?
No. All parsing and formatting happens entirely in your browser, so sensitive data never leaves your device.
Does it support nested objects and arrays?
Yes. Any valid JSON structure — deeply nested objects, arrays, numbers, booleans, and null — is formatted and validated correctly.

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